【单选题】【消耗次数：1】
7. They hope to_________the source of the infection.
①
track down
②
look down
③
look at
④
back down
参考答案：
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相关题目
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]7. Once,[填空1]a movie, she was knocked down by a running bicycle.
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]1. My dear, do not[填空1]such gloomy thoughts. Let us hope for better things.
【单选题】
Can you turn down the radio, please?
①
Oh, I know
②
I’m sorry, I didn’t realize it was that loud
③
I’ll keep it down next time
④
Please forgive me
【填空题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]4. If you dont lace up your shoes, youll[填空1].
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]6. We[填空1]hearing from you soon.
【简答题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]2. When they saw the horse, all stood still[填空1].
随机题目
【单选题】
下面描述中错误的一条描述是？
①
一个文件在同一个系统中、不同的存储介质上的拷贝，应采用同一种物理结构
②
文件的物理结构不仅与外存的分配方式相关，还与存储介质的特性相关，通常在磁带上只适合使用顺序结构
③
采用顺序结构的文件既适合进行顺序访问，也适合进行随机访问
④
虽然磁盘是随机访问的设备，但其中的文件也可以使用顺序结构
【单选题】
下面描述中正确是？
①
顺序文件适合于建立在顺序存储设备上，而不适合建立在磁盘上
②
显式链接文件将分配给文件的下一个物理盘块的地址登记在该文件的前一个物理盘块中
③
顺序文件必须采用连续分配方式，而链接文件和索引文件则可采用离散分配方式
④
在MS-DOS中采用的是隐式链接文件结构